Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1s/rev/54fb2ab8a7f8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge branch 'v2.1' into v2.1s

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https://hg.mozilla.org/integration/gaia-2_1s/rev/cb7c6d5c4190
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Bug 1052227 - Move inapp pay test to packaged to avoid mochitest failures. r=kumar

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https://hg.mozilla.org/integration/gaia-2_1s/rev/016c60830302
Author: PYChen, GaryChen <mmm198219@gmail.com>
Desc: Bug 1032441 - change css

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https://hg.mozilla.org/integration/gaia-2_1s/rev/9d93c929d521
Author: Wil Clouser <wclouser@mozilla.com>
Desc: Merge pull request #29721 from ngokevin/v2.1

Bug 1158390 - update marketplace packages for v2.1

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https://hg.mozilla.org/integration/gaia-2_1s/rev/650c94c8cffa
Author: Kevin Ngo <ngoke@mozilla.com>
Desc: Bug 1153890 - update marketplace packages for v2.1